<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Bootstrap 实例 - 堆叠的水平</title>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.staticfile.org/jquery/2.0.0/jquery.min.js"></script>
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
    <h1>Hello, world!</h1>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <button>AA</button>
        </div>
    </div>
</div>

</body>
</html>